#define _CRT_SECURE_NO_WARNINGS	

#include<stdio.h>
#include<math.h>
const double n = 1e-6;
int main()
{
    double a, b, c;
    scanf("%lf%lf%lf", &a, &b, &c);
    double max = (a > b) ? a : b;
    max = (max > c) ? max : c;
    double min = (a < b) ? a : b;
    min = (min < c) ? min : c;
    double mid = a + b + c - min - max;
    a = max;
    b = mid;
    c = min;
    if (b + c <= a)
        printf("Error\n");
    else
    {
        double a1 = pow(a, 2);
        double b1 = pow(b, 2);
        double c1 = pow(c, 2);
        if (fabs(a1 - b1 - c1) <= n)
            printf("Triangulo Retangulo\n");
        else if (fabs(a1 - b1 - c1) > n && a1 - b1 - c1 > n)
            printf("Triangulo Obtusangulo\n");
        else if (fabs(a1 - b1 - c1) > n && a1 - b1 - c1 < -n)
            printf("Triangulo Acutangulo\n");
        if (fabs(a - b) <= n && fabs(b - c) <= n)
            printf("Triangulo Equilatero\n");
        if (fabs(a - b) <= n || fabs(b - c) <= n || fabs(a - c) <= n)
            printf("Triangulo Isosceles\n");
    }
    return 0;
}